I'm pretty sure it will be later in the season; it's the episode titled "Heathridge Manor", and it will be directed by Matthew Gray Gubler (Reid! Yay!). He posted a picture of himself and Mr. Englund here. Hope it helps!

Kirsten Vangsness and MGG have also been in "Thrilling Adventure". It's a big family affair. Great show, I recommend anyone who can see it to do so. I'm looking forward to this. Will be nice to see Juliet on my TV screen again, even if it's a small part.